摘要:
High voltage electric cables of the kind having a laminated dielectric comprising lappings of insulating tape impregnated with an insulating liquid enclosed in a liquid-impervious sheath or pipe. Such laminated dielectric is most commonly built up from lappings of paper tape although proposals have been made to use plastics film along or interleaved with paper and it has been proposed that plastics film having on one or both sides an adherent layer of fibrous material should be used. More particularly the invention relates to such a cable in which the insulating liquid is a liquefied gas which, in addition to forming part of the dielectric, acts as a cooling medium thus increasing the cable rating for a given conductor cross-section.
摘要:
The central conductor of a gas-insulated flexible cable consists of separate concentric tubes which are alternately spirally corrugated and annularly corrugated so that the corrugations will not nest relative to one another and are axially movable relative to one another.
摘要:
A direct current, electric, submarine cable which may be used in long lengths and at great depths and which has improved voltage breakdown characteristics with respect to voids which form in the insulation. The cable has a conductor surrounded by an inner semi-conductive screen which is surrounded by cellulose paper tape insulation which is surrounded by an outer semi-conductive screen which is surrounded by a metal sheath. The paper tape is impregnated with a compound comprising a viscous hydrocarbon oil containing a substance having polar groups, the amount of the substance being sufficient to make the volume resistivity of the compound 100 times lower than the volume resistivity of the tape with the compound therein.
摘要:
A high voltage electric power transmission line having an electrical power carrying capacity of 50 megawatts or more. An electrical power conductor is contained within a substantially rigid dielectric casing formed of a plurality of elongated tubular glass casing sections hermetically bonded together linearly end to end forming a continuous elongated casing around the conductor. The casing is loosely contained in an outer duct which permits lateral movement of the casing in the duct but places a maximum limit on such movement.
摘要:
High voltage cable with a particular first, inner conductor of circular outer cross section and contour, and a second tubular conductor coaxially arranged to the first conductor, having inwardly projecting corrugation crests of convex contour, projecting inwardly towards the inner conductor. The radius of curvature of the convexity is selected so that the electric field strength immediately adjacent the corrugation crests of the second conductor is about similar to or somewhat smaller than the field strength immediately adjacent the first conductor.
摘要:
A pressurized gas-insulated enclosed high-voltage conductor or conductors are located axially within a surrounding grounded pipe, and enlarged expansion joints for accommodating a wide range of temperatures are provided. Additionally, to prevent a sudden surge of transient pressure being developed along the pressurized transmission line, space gas barrier constructions having orifices are provided.